1. Mining

   Due to the relatively low grade of most molybdenum ores, high efficiency mining technology is needed, generally including:

   1. Large scale open pit mining;

   2.underground mining block caving mining, this method can make big boulders broken and weight reduced.

   2. Ore dressing

   The ore can be reduced to 1 microns (1/1000mm) after a series of crushing and grinding (ball milling or rod grinding), which separates the molybdenite from the matrix rocks. Some agents (including some fuels and diesel) are used for sizing, which are attached to the surface of molybdenum particles and used as hydrophobic agents.

   The flotation separation is carried out in the ventilation tank, and the molybdenum particles contact with the foam suspended in the air, and the concentrate floats on the foam surface and enters the flow channel. After that, the grade of molybdenum concentrate can be improved by removing and removing other impurities in the regrinding and reelection process. The final concentrate contains molybdenite 70% to 90%. If necessary, the impurities such as copper and lead can be removed by acid leaching.

   3. Roasting

   The molybdenum concentrate can be transformed into industrial molybdenum oxide after roasting. The molybdenum concentrate is roasted in a large multi chamber furnace or calciner, and the calcination temperature is 600~700 degrees C. Molybdenum concentrate is stirred by a stirring rake to move the material from the center of the hearth to the next layer and then back to the center of the furnace, so that the uniform air flow is circulated in the 12 or more furnace layers for 10 hours. The final product - Industrial molybdenum oxide generally contains Mo less than 57% and sulfur less than 0.1%.

   Some of the by-product molybdenum copper deposits contain a small amount of rhenium (rhenium is a metal element, rhenium is used in the field of catalyst for the production of lead-free gasoline, and is used in the high superalloy field to make turbine blades for jet engines. " Rhenium is an important rare metal resource recovered in the process of roasting molybdenum concentrate.

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